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Abstract <p>Methods of physicochemical analysis, thermodynamics, and kinetics were used to interpret the sorption interaction of the new graphene oxide composite TiO<sub>2</sub>||C and of TiO<sub>2</sub> derived from it with La(III) and Ce(III) ions in the Henry region. The variance analysis of experimental sorption isotherms showed the identity of the sorption characteristics of TiO<sub>2</sub>||C and TiO<sub>2</sub> in the framework of the Langmuir model. The sorption equilibrium in the systems under consideration was proved by the coincidence of the experimental and literature values of the La(III) and Ce(III) ion hydrolysis constants and the data of sorption kinetics. The presence of surface terminal and bridging OH groups in TiO<sub>2</sub>, according to <sup>1</sup>H NMR data, allowed using a model of surface complexation with the participation of functional groups {≡TiOH<sup>0</sup>} and {≡TiO<sup>–</sup>} to describe the sorption. Varietal Henry’s constants of sorption of hydroxy and carbonate complexes of La(III) and Ce(III) within the framework of the two-<i>K</i><sub>a</sub> model were found. The pH region of extremely high values of log<i>K</i><sub>d</sub> [mL/g] = 6 in the region of predominance of hydroxo and carbonate complexes was experimentally established.</p>

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Sorption Mechanism of Interaction of the Oxide–Graphene Composite TiO2||C and of Titanium Oxide Derived from It with La(III), Ce(III) Ions in Ultradilute Solutions

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • E. V. Polyakov,
  • V. N. Krasilnikov,
  • I. V. Volkov,
  • A. A. Ioshin,
  • T. A. Denisova,
  • N. A. Zhuravlev

摘要

Abstract

Methods of physicochemical analysis, thermodynamics, and kinetics were used to interpret the sorption interaction of the new graphene oxide composite TiO2||C and of TiO2 derived from it with La(III) and Ce(III) ions in the Henry region. The variance analysis of experimental sorption isotherms showed the identity of the sorption characteristics of TiO2||C and TiO2 in the framework of the Langmuir model. The sorption equilibrium in the systems under consideration was proved by the coincidence of the experimental and literature values of the La(III) and Ce(III) ion hydrolysis constants and the data of sorption kinetics. The presence of surface terminal and bridging OH groups in TiO2, according to 1H NMR data, allowed using a model of surface complexation with the participation of functional groups {≡TiOH0} and {≡TiO–} to describe the sorption. Varietal Henry’s constants of sorption of hydroxy and carbonate complexes of La(III) and Ce(III) within the framework of the two-Ka model were found. The pH region of extremely high values of logKd [mL/g] = 6 in the region of predominance of hydroxo and carbonate complexes was experimentally established.